WO2011094972A1

WO2011094972A1 - Touch screen calibration parameter obtaining method and device

Info

Publication number: WO2011094972A1
Application number: PCT/CN2010/071802
Authority: WO
Inventors: 卢凯; 谢军
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-02-02
Filing date: 2010-04-15
Publication date: 2011-08-11
Also published as: EP2518594A1; EP2518594A4; CN101727243B; CN101727243A; US20120287087A1

Abstract

A touch screen calibration parameter obtaining method involves displaying at least two calibration reference points set in advance on a Liquid Crystal Display LCD screen, obtaining physical coordinates of sampling points obtained by clicking in positions corresponding to the calibration reference points on the touch screen and displaying the sampling points according to the physical coordinates and the calibration parameter; and when it is determined that the displayed sampling points do not overlap with the corresponding calibration reference points, adjusting the distances between the sampling points and the corresponding calibration reference points, determining minimal deviation between each adjusted sampling point and the corresponding calibration reference point, and applying the minimal deviation to update the calibration parameter. A touch screen calibration parameter obtaining device is also provided. The method and the device enable improving use experience when the user carries out calibration, and helping the user to obtain the more precise calibration parameter.

Description

Method and device for acquiring touch screen calibration parameters

The present invention relates to the field of electronic information technology, and in particular, to a method and an apparatus for acquiring touch screen calibration parameters. Background technique

Most of the terminal interaction devices in the prior art are equipped with a touch screen to provide users with convenient and fast input methods. According to the working principle of the touch screen and the medium for transmitting information, the touch screen can be divided into four types, which are a resistive touch screen, an infrared touch screen and a capacitive inductive touch screen, and a surface acoustic wave type touch screen.

Nowadays, the most widely used is the resistive touch screen, whose surface consists of two layers of transparent material coated with conductive medium, indium oxide (OTI). When the touch screen is under pressure, the two transparent materials are turned on, and the touch screen control chip scans the XY of the touch screen. The axis is used to obtain the potential of the pressure point, and then the A/D conversion is performed to obtain the physical coordinates generally described, and then the liquid crystal display (LCD, Liquid Crystal Display) point coordinates according to the potential of the touch point X/Y axis and the corresponding position. The proportional relationship of the XY axes converts the A/D converted potential value on the touch screen into a coordinate point on the LCD, which is a so-called logical coordinate. In general, even with the same touch screen, the resistance between the touch points will be different, and as the usage time increases, the resistance of the touch screen itself will change, in order not to affect the accuracy and sensitivity of the touch screen. The calibration parameters must also be modified accordingly.

The current calibration method is to display several points on the LCD first, and then the user clicks on these points on the touch screen. The program calculates new calibration parameters based on the points displayed on the LCD and the points clicked by the user. The Chinese Patent Application Publication No. CN101354621A, issued on Jan. 28, 2009, the disclosure of which is incorporated herein by reference to the entire entire entire entire entire entire entire content Range if this coordinate point is displayed on the LCD If the upper point is within this range, the point is considered valid. The method process is an improvement of the traditional method, but the essence is to operate on different single points multiple times to complete the calibration. Summary of the invention

Embodiments of the present invention provide a method and an apparatus for acquiring touch screen calibration parameters, which are used to provide a touch screen calibration method based on user input, and improve the accuracy of calibration parameters.

An embodiment of the present invention provides a method for acquiring a calibration parameter of a touch screen, including:

Displaying at least two calibration reference points preset on the liquid crystal display LCD; acquiring physical coordinates of the sample points obtained by clicking corresponding positions of the calibration reference points on the touch screen, and displaying the physical coordinates and calibration parameters according to the physical coordinates and calibration parameters Sample point

If it is determined that the displayed sample point does not coincide with the corresponding calibration reference point, the distance between the sample point and the corresponding calibration reference point is adjusted, and the adjusted sample points and the corresponding calibration reference point are determined. Minimum deviation, the calibration parameter is updated using the minimum deviation.

When the calibration reference point is multiple, determining the minimum deviation of each adjusted sample point from the corresponding calibration reference point includes:

Obtaining the distance between each calibration reference point and the corresponding sample point, and determining the minimum value of the sum of the distances of each calibration reference point and the corresponding sample point, and using the minimum value as the minimum deviation between the sample point and the calibration reference point .

When the calibration reference point is two, it is determined that the minimum deviation of each adjusted sample point from the corresponding calibration reference point includes:

Determining that two calibration reference points are on the same line as the two sample points;

Obtaining a first distance between the first calibration reference point and the corresponding first sample point and a second distance between the second calibration reference point and the corresponding second sample point, and minimizing a minimum sum of the first distance and the second distance as a minimum deviation.

According to the above method, the embodiment of the present invention further provides a touch screen calibration parameter obtaining device, including: a sample point display module, configured to display at least two preset calibration reference points on the liquid crystal display LCD, obtain physical coordinates of the sample points obtained by clicking corresponding positions of the calibration reference points on the touch screen, and according to the Physical coordinates and calibration parameters display the sample points;

a calibration parameter determining module, configured to: if it is determined that the displayed sample point does not coincide with the corresponding calibration reference point, adjust a distance between the sample point and the corresponding calibration reference point to determine the adjusted sample points The minimum deviation from the corresponding calibration reference point is applied to update the calibration parameter.

When the calibration reference point is two, the calibration parameter determining module determines that the minimum deviation of each adjusted sample point from the corresponding calibration reference point is specifically:

Determining that the calibration reference point is on the same line as the sample point;

Obtaining a first distance of the first calibration reference point from the corresponding first sample point and a second distance between the second calibration reference point and the corresponding second sample point, and using the minimum value of the first distance and the second distance sum as Minimum deviation.

When the calibration reference point is multiple, the calibration parameter determination module determines that the minimum deviation of each adjusted sample point from the corresponding calibration reference point is specifically:

By applying the method and device provided by the embodiments of the present invention, it is not necessary to perform multiple operations on different single points for calibration, and the calibration can be completed by directly operating a group of points at one time. Improve user experience during calibration and help users get more accurate calibration parameters. DRAWINGS

1 is a flowchart of a method for acquiring calibration parameters of a touch screen according to an embodiment of the present invention; FIG. 2 is a schematic diagram of a simulation when two calibration reference points are used in an embodiment of the present invention;

FIG. 3 shows two calibration reference points in the embodiment of the present invention, and the mode after the sample point adjustment is performed. Schematic diagram

4 is a schematic diagram of simulation when the calibration reference point is three in the embodiment of the present invention;

FIG. 5 is a schematic diagram of simulation when there is no calibration deviation in the embodiment of the present invention; FIG.

6 is a schematic diagram of simulation after performing sample adjustment when the calibration reference point is three in the embodiment of the present invention;

FIG. 7 is a structural diagram of a touch panel calibration parameter acquiring apparatus according to an embodiment of the present invention. detailed description

In the embodiment of the present invention, a touch screen calibration parameter acquisition method is configured to display at least two calibration reference points preset on a liquid crystal display LCD; and obtain a physical point of a sample point obtained by clicking a corresponding position of the calibration reference point on the touch screen Coordinates, and displaying the sample points according to the physical coordinates and the calibration parameters; if it is determined that the displayed sample points do not coincide with the corresponding calibration reference points, adjusting the distance between the sample points and the corresponding calibration reference points And determining a minimum deviation of each adjusted sample point from the corresponding calibration reference point, and applying the minimum deviation to update the calibration parameter.

The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 , a method for acquiring a calibration parameter of a touch screen according to an embodiment of the present invention, the specific implementation steps include:

Step 101: Display at least two preset calibration reference points on the LCD;

The calibration reference point is a set of points with fixed coordinates. When the user calibrates the touch screen, the set of calibration reference points is displayed on the LCD level, and is set to group A.

Step 102: Obtain physical coordinates of the sample points obtained by clicking corresponding positions of the calibration reference points on the touch screen, and display the sample points according to the physical coordinates and the calibration parameters;

The calibration parameter is a proportional relationship between the relative position of the LCD and the touch screen, that is, a proportional relationship between the logical coordinates of the LCD display and the physical coordinates of the clicked position of the touch screen;

When the user clicks the corresponding position of the calibration reference point on the touch screen, the physical coordinates obtained by clicking the corresponding position of the calibration reference point on the touch screen are obtained, and are determined according to the calibration parameter. a proportional relationship between the physical coordinates and the corresponding position coordinates of the LCD, converting the physical coordinate values into logical coordinates on the LCD, displaying the sample points according to the logical coordinates, and setting the set of sample points to the B group.

Step 103: If the displayed sample point does not coincide with the corresponding calibration reference point, adjust a distance between the calibration reference point and the corresponding calibration reference point, and determine each adjusted sample point and the corresponding calibration reference point. The minimum deviation, and the minimum deviation is updated for the calibration parameter.

There are a plurality of methods for judging whether the sampling point and the calibration reference point coincide. In the embodiment of the present invention, whether the sampling point is aligned and the calibration can be determined by determining whether the logical coordinate of the sampling point and the logical coordinate of the calibration reference point are the same. The reference points coincide, if they are not the same, they do not coincide.

You can minimize the relative position of group B and group A by shifting the XY coordinates up, down, left, and right, or by rotating one of the points of group B.

When the group B point is adjusted, any manner of adjusting the group B point by using the touch screen, the button operation, or directly inputting the adjustment parameter can be applied to the embodiment of the present invention.

In the embodiment of the present invention, the user can adjust the B group point multiple times until the distance between the two groups of A and B is the smallest. During the process of adjusting the B group point, the user calculates a new parameter according to the data input by the display screen, and then Compared with the saved parameters, the optimal parameters are selected as the calibration parameters input by the user next time.

In the embodiment of the present invention, the calibration reference point includes a plurality of, and each calibration reference point corresponds to one sample point. As shown in FIG. 2, if the calibration reference point includes two, the specific implementation manner is:

In the figure, box 2 is the area of the LCD, and the area enclosed by box 1 is the touch screen area. A, B and A, and B are the points displayed on the LCD. When the calibration procedure is invoked, it specifically includes:

The LCD will display two absolute coordinate points, ie, points A and B in the calibration reference point. A, B, is the corresponding position of the user clicking the A and B points on the touch screen according to their own click habits and visual effects. After that, the LCD displays the point at which the user clicks on the touch screen according to the proportional relationship between the LCD and the touch screen. If the LCD and the touch screen are completely coincident, and the resistance distribution of the touch screen is checked, and the calibration parameters are extremely accurate, A and A, B and B should be completely coincident.

If the LCD and the touch screen do not coincide, the A', B' two points are moved by an external operation, and the large distance between the two points A', B, and eight and B is adjusted.

In the process of adjusting the distance between the two sets of points, move A, and Β' according to the input data, and calculate new parameters according to the moved A' and B' to judge whether the new parameter is optimal, and select the optimal parameter update to save. Calibration parameters.

There are various methods for judging whether the new parameters are optimal. In this embodiment, the "variance method" is taken as an example for description, but is not limited to such a method, and the specific implementation includes:

If Α, Β, and 八, Β point corresponding coordinates are (Α, X, A, y), (B, x, B, y), (Ax, Ay), (Bx, By);

First determine whether the two sets of points are on the same line, that is, (Ax-Bx) I ( Ay-By ) is equal to (A, xB' x) / (A, yB' y), if not in a straight line, then four The point adjustment is on a straight line, and the sample points A, B are adjusted to the straight lines determined by the calibration reference points A and B respectively, as shown in Fig. 3;

If (Ax-Bx) I (Ay-By) = ( A, xB' x ) / ( A, yB' y) then calculate the distance between the two sets of points, that is, the first distance of point A and A, |A, A |, B and B, the second distance of the point |B, B|;

The minimum value of the sum of the first distance and the second distance (ie, the minimum deviation between the calibration reference point and the sample point) is obtained, and the minimum value is taken as a calibration parameter. D is called A, A|+|B, B|. In the embodiment of the present invention, D is called A, and A|+|B, B is smaller, indicating that the error between the two groups is smaller, and the calculated calibration parameter is smaller. The more precise.

When the calibration reference point is plural, adjusting the sample point, and determining a minimum deviation of the sample point from the calibration reference point, determining a distance between each sample point and a corresponding calibration reference point, The minimum value of the sum of all calibration reference points and the corresponding sample point distance is taken as the minimum deviation between the sample point and the calibration reference point. The specific implementation includes:

As shown in Fig. 4, Fig. 5 and Fig. 6, the box 2 indicates the LCD display area, and the box 1 area is the touch screen area. Points A, B, and C are fixed points on the LCD. A, B, and C are based on the proportional relationship between the LCD and the touch screen. When the user clicks on the corresponding position of the touch screens A, B, and C, the LCD displays Sample points. The purpose of the user is to move A', B', C, and points as a whole, so that A', B', and C points coincide with A, B, and C points as much as possible. In the process of adjusting the relative relationship between the two sets of points, according to the user input, a new parameter indicating the deviation between the two sets of points is calculated, and the optimal parameter is selected as the calibration parameter input by the next user.

There are many ways to judge whether the new parameters are optimal. Here, the "minimum distance method" is used, that is, the distance difference between the two points corresponding to the two points is determined to be the smallest, and the obtained calibration parameters are also optimal, but it is not limited to this method.

Assume that the distance difference between the two sets of points is D. If the two sets of points are completely coincident, as shown in Figure 4, then D should be 0. If the two sets of points cannot be completely coincident, as shown in Figure 5, the calibration parameters should be selected based on The point when D is closest to 0.

As shown in FIG. 7, an embodiment of the present invention further provides a touch screen calibration parameter obtaining apparatus, which includes a setting module 700, a sample point display module 701, and an adjustment module 702;

The setting module 700 is configured to pre-set at least two calibration reference points on the LCD; the sample point display module 701 is configured to display at least two preset calibration reference points on the LCD, and obtain a calibration reference point on the touch screen. Corresponding to the physical coordinates of the sample points obtained by clicking the position, and displaying the sample points according to the physical coordinates and the calibration parameters, the calibration parameters being a proportional relationship between the relative positions of the LCD and the touch screen;

The calibration parameter determining module 702 is configured to adjust a distance between the sample point and the corresponding calibration reference point to determine the adjusted sample if it is determined that the displayed sample point does not coincide with the corresponding calibration reference point. The minimum deviation of the point from the corresponding calibration reference point, the minimum deviation is applied to update the school Quasi-parameters.

The calibration reference point in the embodiment of the present invention may be two or more. According to the number of calibration reference points, the specific application of the adjustment module 702 includes:

When the calibration reference point is two, the adjustment module 702 determines that the minimum deviation of each adjusted sample point from the corresponding calibration reference point is specifically:

Obtaining a first distance between the first calibration reference point and the corresponding first sample point and a second distance between the second calibration reference point and the corresponding second sample point, and a minimum value of a sum of the first distance and the second distance As the minimum deviation.

When the calibration reference point is multiple, the adjustment module 702 determines that the minimum deviation of each adjusted sample point from the corresponding calibration reference point is specifically:

The conventional calibration method is to achieve calibration by clicking on a plurality of points on different touch screens, and the method provided by the embodiment of the present invention operates at least two (including two points) at a time to complete the calibration.

Compared with the traditional calibration method, the method can not only reduce the error, but also improve the accuracy of the calibration. In addition, the method provided by the embodiment of the present invention also takes into account the error formed by the user in the process of using the touch screen, and the habit error is new. It is reflected in the calibration parameters and is suitable for the user's usage habits, so as to be more user-friendly. Other embodiments of the invention will be apparent to those skilled in the art without departing from the spirit and scope of the invention. Thus, if these modifications and variations of the invention belong to The invention is also intended to cover such modifications and variations within the scope of the appended claims.

Claims

Claim

A touch screen calibration parameter acquisition method, characterized in that at least two calibration reference points and corresponding calibration parameters are preset on a liquid crystal display LCD; the method comprises: displaying the at least two on an LCD Calibration reference points;

Obtaining a physical coordinate of the sample point obtained by clicking the corresponding position of the calibration reference point, and displaying the sample point on the LCD according to the physical coordinate and the calibration parameter;

When it is determined that the displayed sample point does not coincide with the corresponding calibration reference point, the distance between the sample point and the corresponding calibration reference point is adjusted, and the minimum of each adjusted sample point and the corresponding calibration reference point is determined. Deviation, applying the minimum deviation to update the calibration parameter.

2. The method of claim 1 wherein each calibration reference point corresponds to a sample point.

The method according to claim 1, wherein the method further comprises: adjusting a distance between the sample point and a corresponding calibration reference point by a touch screen mode or a button mode.

4. The method according to claim 1, wherein when the number of calibration reference points that are clicked is two or more, the minimum deviation between the adjusted sample points and the corresponding calibration reference point is determined as: Calibrating the distance between the reference point and the corresponding sample point, and determining the minimum value of the sum of the distances of each calibration reference point and the corresponding sample point, and using the minimum value as the minimum deviation of each sample point from the corresponding calibration reference point .

5. The method according to claim 1, wherein when the clicked calibration reference point is two, the minimum deviation between the adjusted sample points and the corresponding calibration reference point is determined as: determining two calibrations When the reference point is on the same line as the two sample points, obtaining a first distance between the first calibration reference point and the corresponding first sample point, and a second calibration reference point and a second of the corresponding second sample point Distance, the minimum sum of the first distance and the second distance is taken as the minimum deviation.

6. The method according to claim 1, wherein the displaying the sample points according to the physical coordinates and calibration parameters is: Determining, according to the calibration parameter, a proportional relationship between the physical coordinates and the corresponding position coordinates of the LCD, converting the physical coordinate values into logical coordinates on the LCD, and displaying the sample points according to the logical coordinates.

7. The method according to claim 6, wherein the determining the displayed sample points does not coincide with the corresponding calibration reference points:

The logical coordinates of the sample point on the LCD are compared with the logical coordinates of the corresponding calibration reference point. When they are different, it is determined that the displayed sample point does not coincide with the corresponding calibration reference point.

8. A touch screen calibration parameter acquisition device, comprising: a setting module, a sample point display module, and a calibration parameter determination module; wherein:

a setting module, configured to preset at least two calibration reference points and corresponding calibration parameters on the liquid crystal display LCD;

a sample point display module, configured to display the at least two calibration reference points on the LCD, obtain physical coordinates of the sample points obtained by clicking corresponding positions of the calibration reference points, and according to the physical coordinates and calibration parameters Displaying the sample points on the LCD;

a calibration parameter determining module, configured to determine a distance between the sampled point and the corresponding calibration reference point when the displayed sample point does not coincide with the corresponding calibration reference point, and determine the adjusted sample points and A minimum deviation of the corresponding calibration reference point, the calibration parameter being updated using the minimum deviation.

The device according to claim 8, wherein the calibration parameter determining module is further configured to: when the two calibration reference points are clicked, and the calibration reference point is determined to be on the same line as the sample point Obtaining a first distance between the first calibration reference point and the corresponding first sample point and a second distance between the second calibration reference point and the corresponding second sample point, and the minimum distance between the first distance and the second distance As the minimum deviation.

The device according to claim 8, wherein the calibration parameter determining module is further configured to acquire each calibration reference point and pair when the number of clicked calibration reference points is multiple The distance of the sample point should be determined, and the minimum value of the sum of the distances of each calibration reference point and the corresponding sample point is determined, and the minimum value is used as the minimum deviation of the sample point from the calibration reference point.